P0CE4Hybrid/EV Battery Pack Coolant Control Valve Position Sensor Circuit
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- P0CE4 is the general circuit fault of the position feedback from the battery coolant control valve. On motor-driven valves the actuator reports its actual position as a share of the sensor supply voltage, letting the controller confirm that coolant really flows toward the battery, chiller or heater. GM's Volt and ELR monitor this feedback but report its electrical faults as P0CE6 and P0CE7; no manufacturer publicly documents P0CE4 itself. CARB requires battery thermal management inputs to be checked for circuit faults. Likely causes are an open signal, reference or ground wire, a damaged connector at the valve or a failed sensor inside the actuator, which is normally replaced together with the valve. Without feedback the controller may park the valve and limit charging or power. Implausible positions are P0CE5.
- What you may notice
- MIL or hybrid system warning
- Valve held in a default position, thermal conditioning limited
- Likely causes
- LikelyOpen signal, reference or ground wire of the position sensor
- PossibleDamaged or corroded connector at the valve
- PossiblePosition sensor inside the valve actuator failed
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Hard · Usually a job for a workshop.Typical cost: €80 – €600
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.